Make sure you have a plan of the restaurants you want to visit, kno which rides are the most popular and have the longest wait times, and just have a planned out schedule of where you think you want to go each day. Tip: If you are getting hopper passes: go to a park in the morning (maybe for morning extra magic hours), go back to your hotel for lunch and relax in the hotel for a little while, and then later on in the day, go to a different park for supper and maybe stay for evening magic hours.
TIP FOR EVERYONE!!!!!!!! : GO TO THE WATER PARK EVENING MAGIC HOURS!! THERE ARE NO CROWDS WHAT SO EVER, YOU GET TO GO ON WHATEVER YOU WANT (NONE OF THE RIDES CLOSED), AND IT REALLY IS AWESOME!!